521426 has 4 divisors (see below), whose sum is σ = 782142. Its totient is φ = 260712.

The previous prime is 521401. The next prime is 521429. The reversal of 521426 is 624125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 10201 = 715^2 + 101^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521398 and 521407.

It is not an unprimeable number, because it can be changed into a prime (521429) by changing a digit.

521426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130355 + ... + 130358.

2⁵²¹⁴²⁶ is an apocalyptic number.

521426 is a deficient number, since it is larger than the sum of its proper divisors (260716).

521426 is a wasteful number, since it uses less digits than its factorization.

521426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260715.

The product of its digits is 480, while the sum is 20.

The square root of 521426 is about 722.0983312541. The cubic root of 521426 is about 80.4879551954.

The spelling of 521426 in words is "five hundred twenty-one thousand, four hundred twenty-six".